Tips

Enable your microphone for playback by unchecking the mute check box on your PC soundcard mixer <- This will let you announce songs.

Use Skype to conduct telephone call-ins over-the-air

Accept song requests by email from friends and neighbors

Warnings

In the USA, you need a license to legally use an FM transmitter that doesn't comply with part 15 rules. The two methods above are legal to use, but there are stronger transmitters for sale that are not legal in the USA without a license. Not heeding this advice can be costly.